ARCHITECTS FROM LONDON Compare Builder Quotes
for Extensions & Renovations
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Compare Builder Quotes intro
Compare Builder Quotes
You have the quotations back.
Now comes the part that looks easy and usually is not:
Which builder is actually offering the best deal?
The instinct is often to line up the totals and start with the cheapest.
But two builder quotes can be thousands of pounds apart while still being based on completely different assumptions.
One may include decoration, flooring and waste removal.
Another may exclude all three.
One may include realistic allowances for kitchens and bathrooms.
Another may use very low provisional sums that make the headline price look better.
At Tholos, we help compare builder quotations properly so you can understand what each contractor has actually priced before deciding who to appoint.
Compare Builder Quotes
Why Builder Quotes Are So Difficult to Compare
Even when every contractor receives the same drawings, their quotations will rarely look identical.
Builders have different ways of breaking down costs.
Some provide detailed schedules.
Others group several trades together.
Some clearly list exclusions.
Others leave important assumptions buried within notes.
The first job is therefore not deciding which quote is cheapest.
It is checking whether the quotations are actually based on the same scope of work.
Compare Builder Quotes
Start With the Headline Price, Then Ignore It for a Moment
The total price matters.
Obviously.
But it should not be the first and only comparison.
Imagine receiving:
Builder A: £96,000
Builder B: £103,000
Builder C: £108,000
Builder A immediately looks £12,000 cheaper than Builder C.
But then you discover:
- Builder A excludes decorating
- Builder A has a £3,000 kitchen allowance
- Builder C includes decorating
- Builder C has allowed £8,000 for the kitchen
- Builder C includes external drainage that Builder A has excluded
Suddenly the £12,000 gap means something very different.
The total should be compared only after the content behind it is understood.
Compare What Is Included
The easiest place to start is by identifying what each builder has included in their price.
Depending on the project, this might cover:
- site setup
- demolition
- foundations
- structural work
- roofing
- windows and doors
- plumbing
- electrics
- plastering
- flooring
- decorating
- waste removal
- external works
If one contractor has priced a more complete package, their higher total may actually represent better value.
Check the Exclusions Carefully
Exclusions are one of the most important parts of any builder quotation.
A contractor may appear cheaper simply because more of the project sits outside their price.
Common exclusions can include:
- kitchens
- sanitaryware
- flooring
- decorating
- landscaping
- utility alterations
- specialist glazing
- Building Control fees
- scaffolding
- waste removal
There is nothing inherently wrong with exclusions.
They just need to be visible.
A cheap quote becomes much less attractive if you later discover another £15,000 of work needs to be added.
Check the Exclusions Carefully
Provisional sums are allowances for work or items where the final cost is not yet known.
They are common in construction.
But they can make two quotations look more comparable than they really are.
For example:
Builder A drainage allowance: £2,500
Builder B drainage allowance: £7,000
If the actual drainage work eventually costs £6,500, Builder A’s initial quote will increase significantly.
Builder B’s will barely move.
The cheaper tender may therefore only be cheaper because the allowance is lower.
Compare Allowances on the Same Basis
The same issue applies to products that have not yet been selected.
One builder may allow £25 per square metre for flooring.
Another may allow £60.
Both can honestly say flooring is included.
But they are not pricing the same product.
Allowances should therefore be compared for items such as:
- flooring
- sanitaryware
- kitchens
- tiles
- ironmongery
- light fittings
- appliances
If the specification is not fixed, it should at least be clear what level of allowance each builder has used.
Has Everyone Included the Structural Work?
Structural work can create major differences between quotes.
Check whether each contractor has included:
- steel beams
- columns
- pad foundations
- structural alterations
- temporary support
- associated labour
If the structural design was issued as part of the tender, the quotations should be checked against it.
A contractor who has missed a major beam or foundation element may appear considerably cheaper until the omission is corrected.
compare building quotes
Check the Drawings Each Builder Has Priced
This sounds basic, but it matters.
Tender packages sometimes change while contractors are pricing.
A revised structural drawing may be issued.
A window size may change.
A technical detail may be added.
Before comparing the quotes, check that everyone has priced the same revision of the information.
Otherwise you may be comparing contractors who were literally asked to build different projects.
Is VAT Included?
Never assume.
Some quotations show VAT clearly.
Others state that it will be added.
Some contractors may not be VAT registered.
When comparing prices, make sure you are looking at the actual amount you would pay.
A £100,000 quotation plus VAT is obviously not equivalent to a £100,000 quotation including VAT.
It is simple, but surprisingly easy to miss when quotations are formatted differently.
Compare the Programme Too
Price is not the only thing being offered.
The construction programme matters as well.
One builder may propose a 16-week build.
Another may estimate 24 weeks.
That difference could affect:
- temporary accommodation
- storage
- childcare arrangements
- disruption to your home
- financing
- the timing of other trades
A slightly cheaper contractor is not automatically better value if the project takes significantly longer and creates substantial additional costs elsewhere.
Check the Proposed Start Date
Availability can make a real difference.
A contractor may provide the best price but not be available for nine months.
Another may be able to start much sooner.
Neither is automatically right or wrong.
You simply need to understand how their availability fits with your priorities.
The key is making that decision consciously rather than discovering the delay after choosing the builder.
Look at Payment Terms
Payment arrangements should also be compared.
A quotation may set out:
- stage payments
- monthly valuations
- deposits
- material payments
- payment deadlines
Be cautious where a contractor wants a very large amount upfront without a clear relationship to materials or work being undertaken.
Cash flow is important for builders.
But the homeowner should not be financing a large portion of the project far ahead of progress on site.
compare building quotes
Compare More Than the Numbers
Some things do not sit neatly inside a spreadsheet.
You are choosing someone who may spend months working on your property.
Consider:
Did they read the drawings carefully?
Did they ask sensible questions?
Did they return the quote when they said they would?
These things can give useful clues about how they may approach the construction stage.
A Detailed Quote Is Usually Easier to Trust
More detail does not automatically make a builder better.
But a detailed quotation usually makes the offer easier to assess.
It shows how the contractor has interpreted the project.
It also makes it easier to identify:
- missing items
- unrealistic allowances
- provisional sums
- duplicated costs
- exclusions
A one-line quote for £120,000 may eventually prove perfectly fair.
But it gives you very little information to work with before signing a contract.
What If One Builder Is Much Cheaper?
A very low quote deserves investigation.
Not panic.
Investigation.
There can be perfectly legitimate reasons for a price difference.
A contractor may have:
- lower overheads
- better supplier rates
- their own labour force
- better availability
- a more efficient construction method
But the price may also be lower because something has been omitted or underestimated.
Before accepting a significantly cheaper quote, check the scope line by line.
What If One Builder Is Much More Expensive?
The same principle applies.
The most expensive contractor is not automatically overcharging.
They may have included more.
They may be using higher specifications.
They may have identified risks that others have ignored.
Or they may simply be more expensive.
The purpose of comparison is to understand which explanation applies.
Normalising the Quotes
Sometimes the clearest way to compare tenders is to bring them onto the same basis.
This means adjusting for obvious differences.
For example:
Builder A: £98,000
- £5,000 decorating excluded
- £3,000 flooring allowance difference
Adjusted comparison: £106,000
Builder B: £104,000
All equivalent items included.
Now the actual difference is much smaller.
This process does not change the builder’s quote.
It simply helps you compare the offers more fairly.
Clarifications Before You Choose
It is completely normal to go back to builders with questions after reviewing their quotations.
You might ask:
- Is this item included?
- What does this allowance cover?
- Is VAT included?
- Has the latest structural drawing been priced?
- Is scaffolding included?
- What is excluded from the electrical work?
- Does the programme include lead times?
The answers should be documented.
If the clarification changes the price, the builder can issue a revised quotation.
Do Not Compare Quotes Forever
There is a point where analysis stops being useful.
You are trying to create enough clarity to make an informed decision.
You are not trying to make three different companies produce perfectly identical documents.
Once the major differences, assumptions and exclusions are understood, you can move into the final selection.
compare building quotes
Should You Negotiate?
Sometimes.
But negotiation is more useful when it is based on something specific.
For example:
- changing a material
- removing part of the scope
- simplifying a detail
- adjusting an allowance
- phasing non-essential work
Simply saying:
“Builder B is £8,000 cheaper. Can you match it?”
may not make sense if Builder B has excluded £10,000 worth of work.
Understand the difference first.
Then negotiate intelligently if appropriate.
What If All the Quotes Are Over Budget?
If several suitable contractors independently price the project above budget, that is important information.
At that stage, the project itself may need reviewing.
You might consider:
- simplifying expensive details
- changing material specifications
- reducing part of the scope
- phasing some work
- reviewing structural complexity
The advantage of finding this out before construction is that you still have control.
It is far easier to redesign on paper than to cut costs after half the house has been opened up.
Price Is Only Part of Builder Selection
By the end of the comparison, you should ideally understand:
- the real cost difference
- what each builder has included
- what remains uncertain
- the likely programme
- payment arrangements
- contractor experience
- the main risks in each proposal
Only then does the headline figure become genuinely useful.
The cheapest contractor may still be the best choice.
The difference is that you will know why you are choosing them.
From Quote Comparison to Final Builder Selection
Once the offers have been clarified and compared, you can identify the preferred contractor.
Before formally appointing them, the final agreed scope should be confirmed.
Any tender clarifications or negotiated changes should also be carried through into the contract documents.
You want the builder you appoint to be signing up to the same project you just spent time comparing.
How Tholos Helps Compare Builder Quotes
We help homeowners move beyond simply comparing totals.
Depending on the project, we can review:
- scope
- exclusions
- provisional sums
- allowances
- tender clarifications
- structural items
- programme
- payment information
- significant pricing differences
The goal is not to choose a builder on your behalf.
It is to give you a clearer picture of what each contractor is actually offering.
Client experience
"
Lorem ipsum dolor sit amet, consectetur adipiscing elit. We had a vision for our home but no idea how to realise it. Tholos Interiors took complete ownership of the project — every detail was considered, every decision explained. The result exceeded everything we had imagined.
– Lawrence Ipsum, Homeowner · London –
Frequently Asked Questions
Should I always choose the cheapest builder quote?
No. The cheapest quote may represent good value, but you first need to understand the scope, exclusions, allowances and contractor suitability.
What is the most important thing to compare?
Start by checking whether each builder has priced the same scope. A price comparison is only useful once you know the offers are broadly equivalent.
Can I ask a builder to revise their quote?
Yes. Clarifications and revised quotations are common where missing information, exclusions or tender questions need to be resolved.
Is a more detailed quote better?
It is usually easier to assess because it shows more clearly what has been included, although detail alone does not guarantee contractor quality.
Should I compare construction times as well as price?
Yes. Programme and start date can have a significant practical and financial impact on the project.
Ready to Choose Your Builder?
If you have several builder quotations and are not sure whether you are really comparing like with like, Tholos can help identify the important differences before you make the final decision.
Once the preferred contractor and price are clear, the next step is making sure the agreed scope is properly carried into the building contract.
Disclaimer:
This article is part of a series created by our dynamic marketing team for informational purposes only. While we strive to review all content thoroughly, occasional oversights may occur, even after publication. Therefore, we cannot accept liability for any interpretations or use of the information provided. For the most up-to-date information or to report any discrepancies, please contact us at hello@tholos-architects.com.
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